I picked up the 2003 Tron 2.0 for PC and it runs fine under Windows. There is a trick though. First, you have to go to Intel's website and download the drivers for the GMA950 graphics. Then you need to go to http://tronfaq.blogspot.com/ and download the latest drivers. Once both of those were installed the game ran and didn't give me any hassle about insufficient hardware.

I took the plunge and bought Star Wars: Best of PC which contains Empire at War, Knights of the Old Republic, Battlefront (had it in OS X Tiger but never ran in Leopard), Jedi Outcast and Republic Commando. Under Windows, all the games run fine. I had to install KOTOR before Jedi Outcast, and each game gives a pop-up about insufficient hardware, but once you click "OK" you're presented with each game entirely at the default hardware setting.

I'm not running them under the Mac OS but under Windows XP, and I have the 1.83 GHz Core 2 Duo machine. Add this to another game that runs fine in the Mini, under Windows though.